To be honest I don't understand your question.

However, if you want to generate a breakpoint at runtime then insert a call
to DebugBreak() in your source. If your application has not installed an
exception handler then the default exception handler will try to make use of
a Just-In-Time (JIT) debugger. The JIT debugger is specified in the registry
key

   HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\Current Version\AeDebug

VC++'s installation sets this key. You may need to set it by hand if
DebugBreak() does not work because your IDE does not set the key.

If the application you are trying to debug has set up an exception handler
it may try to discard the debug signal. In that case, you'd need to invoke
the default exception handling mechanism:

__try
{
 DebugBreak();
}

__except( UnhandledExceptionFilter( GetExceptionInformation() ) )
{
}

Regards,
Will